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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands | Nov. 30, 2017 | Nov. 30, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross Carrying Amount | $ 239,843 | $ 192,628
Intangible Assets, Accumulated Amortization | (144,949) | (111,801)
Total | 94,894 | 80,827
Purchased Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross Carrying Amount | 154,301 | 109,886
Intangible Assets, Accumulated Amortization | (88,224) | (68,116)
Total | 66,077 | 41,770
Customer Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross Carrying Amount | 67,802 | 67,602
Intangible Assets, Accumulated Amortization | (46,230) | (35,852)
Total | 21,572 | 31,750
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross Carrying Amount | 17,740 | 15,140
Intangible Assets, Accumulated Amortization | (10,495) | (7,833)
Total | $ 7,245 | $ 7,307

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